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Reduce the number of clone()s needed in obligation_forest #52306

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Merged
merged 1 commit into from
Jul 17, 2018
+8 −3
Merged

Reduce the number of clone()s needed in obligation_forest #52306

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11 changes: 8 additions & 3 deletions src/librustc_data_structures/obligation_forest/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -496,9 +496,14 @@ impl<O: ForestObligation> ObligationForest<O> {
}
}
NodeState::Done => {
self.waiting_cache.remove(self.nodes[i].obligation.as_predicate());
// FIXME(HashMap): why can't I get my key back?
self.done_cache.insert(self.nodes[i].obligation.as_predicate().clone());
// Avoid cloning the key (predicate) in case it exists in the waiting cache
if let Some((predicate, _)) = self.waiting_cache
.remove_entry(self.nodes[i].obligation.as_predicate())
{
self.done_cache.insert(predicate);
} else {
self.done_cache.insert(self.nodes[i].obligation.as_predicate().clone());
}
node_rewrites[i] = nodes_len;
dead_nodes += 1;
}
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